Reasonix: Terminal AI Coding Agent Designed to Cut DeepSeek API Costs via Cache Stability

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Reasonix is an open-source terminal coding agent built by the developer community with a core focus on minimising AI API costs through prefix-cache stability. Most agent frameworks silently invalidate DeepSeek's prompt prefix cache by injecting timestamps, reordering tools, or rewriting system prompts at the top of the context, causing expensive cache misses. Reasonix avoids this by keeping the front of the context static, appending rather than mutating, and running its two-model executor-planner setup in separate cache-stable sessions. The tool ships as a single static Go binary with no Node or Python dependencies, and is fully config-driven via a TOML file that supports any OpenAI-compatible API endpoint. Although the repository references DeepSeek by name, Reasonix is an independent community project and not officially affiliated with DeepSeek.

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